Testing loop quantum gravity

One of the challenges of modern physics is to reconcile quantum mechanics and relativity. So far, quantum theories of gravity have never been tested experimentally. Loop quantum gravity, one of these theories, might be testable after all.
The key to this experimental test comes from black holes: when they evaporate, the …

Spacetime torsion: The end of major cosmological problems?

A cosmologist has shown that an already existing extension of general relativity may eliminate major problems in gravitational physics, and answer major questions in cosmology.
The Einstein–Cartan–Sciama–Kibble (ECSK) theory of gravity naturally extends general relativity to account for the intrinsic angular momentum (spin) of elementary particles. This theory, named after Albert Einstein, Élie Cartan, Dennis …

You thought black holes were strange? Think again.

One of the great challenges of modern physics is to reconcile quantum mechanics and relativity. Black holes are an excellent example of the incompatibility between the two theories, and quantum theorists have proposed various alternatives. While they all remain purely hypothetical, they also all seem much weirder than black holes …

Small Bangs: The comeback of white holes?

Gamma-ray bursts are flashes of gamma rays, associated with the most energetic explosions in the universe. Could some of them be white holes? This is the new proposal of Alon Retter and Shlomo Heller, describing white holes as “small bangs”.
Gamma-ray bursts are classified in two categories: long gamma-ray bursts, and …

Mini black holes already on Earth?

Some time ago, it was suggested that expeiments at the Large Hadron Collider could create extremely tiny black holes that would instantly decay. Researchers now suggest that if mini black holes are not just theoretical objects, they may gravitationally bind with matter, without significant absorption. Some might even already be …

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